I don’t disagree that the items you listed can be idols, but anything that takes the attention from God himself can be an idol, as this tunic has become.
Best.
Good. That means you're awake.
but anything that takes the attention from God himself can be an idol,
An idol is a substitute for God. I think we're not really in disagreement here.
as this tunic has become.
That claim assumes facts not in evidence. Quite the contrary, in fact.
In the Middle ages there was a big market in relics of varying classes. Anytime the Pope wanted to bring in a big crowd of pilgrimagers (who paid for the opportunity) and raise funds for this basilica or that refurbishment or when the coffers were running low, some new, never before seen relic would miraculously show up. Some people need signs or tangibles to bolster their faith. Jesus said we are more blessed when we believe without seeing.
I believe God intentionally did away with many things that he knew people would worship rather than Him.